Radio-iodobenzylguanidine for the scintigraphic location and therapy of adrenergic tumors

Radioiodinated meta-iodobenzylguanidine, a recently developed radiopharmaceutical, has been shown to permit safe, noninvasive, sensitive, and specific scintigraphic location of pheochromocytomas of all types. The technique is especially efficacious in the case of extraadrenal primary lesions and locally recurrent and metastatic tumors. In addition to being taken up by pheochromocytomas, meta-iodobenzylguanidine may be used to image neuroblastomas, nonfunctioning paragangliomas, and carcinoid tumors. Lesions with high 131I-meta-iodobenzylguanidine uptake may respond to treatment with large doses of this radiopharmaceutical.     

Submandibular gland sparing when irradiating neck level IB in the treatment of oral squamous cell carcinoma

Patients with oral squamous cell carcinoma (OSqCCA) frequently require postoperative radiation (PORT), which may include contralateral level IB within the clinical target volume (CTV). The submandibular gland (SMG) is typically included within the level IB CTV; however, the SMG does not contain lymph nodes or lymphatic vessels. We hypothesized that level IB could be adequately irradiated while sparing the SMG to reduce xerostomia. Twelve patients with OSqCCA receiving PORT, which included the contralateral level IB within the planning target volume (PTV), were retrospectively reviewed and replanned using volumetric modulated arc therapy. CTV contouring, including contralateral level IB, was in accordance with the consensus contouring atlas but excluded the SMG. The contralateral neck PTVs were planned to 54 Gray (Gy) (PTV54). Dose requirements were per Radiation Therapy Oncology Group-1008: PTV54 D95% >54 Gy, with an allowable variation of >48.6 Gy. The dose constraint for the SMG was mean dose ≤39 Gy based on published dose-effect data for the SMGs. Mean SMG and PTV54 doses were 38.5 Gy and 56.3 Gy, respectively. Median PTV54 D95% was 53.0 Gy (range 52.5 to 54.6 Gy), with all cases meeting our allowable coverage goal. When assessing the portion of the PTV associated with level IB only (PTV_IB), mean PTV_IB dose was 54.4 Gy and median PTV_IB D95% was 43.3 Gy (range 42.5 to 52.2). Median D95% to CTV_IB was 50.2 Gy. SMG sparing resulted in 10% to 20% underdosing of the part of the PTV corresponding to level IB, as a portion of the PTV lies within the SMG. The SMG can be spared to a mean dose ≤39 Gy with slight underdosing of the surrounding PTV where the PTV overlaps with the SMG. Clinical trials evaluating SMG sparing are warranted.     

MEN type IIa syndrome: Dilemmas in modern management

With the use of newer techniques, the multiple endocrine neoplasm II-A syndrome can now be diagnosed early in its evolution. This article discusses the clinical course of the syndrome, the diagnostic modalities employed, and the therapeutic interventions required. An approach to the individual patient with this syndrome is presented.     

Technical considerations in in vivo thyroid studies

Radionuclide thyroid studies, although among the oldest of clinical nuclear medicine procedures, continue to show growth and change. In the 7 years since thyroid studies were last reviewed in the Seminars, there have been marked changes in the preferred ways of doing these studies. In the areas of radiopharmaceuticals, 131I remains a useful agent in selected circumstances, but 99mTc-pertechnetate has become the agent of choice for imaging applications. Iodine-123 represents an exciting possibility for the future if problems in cost and radiopurity can be solved. New data on the dosimetry of the various agents allow for more rational choices among them, and useful guidelines can now be given for the use of these radiopharmaceuticals in problem areas such as pregnancy, nursing, and the pediatric age group. The scintillation camera with a pinhole collimator has become the instrument of choice for thyroid imaging, and the use of computers and the availability of systems for fluorescent scanning have added new possibilities for thyroid evaluation. Ancillary techniques such as ultrasound scanning also offer the possibility of improved diagnostic accuracy. These developments are reviewed in the context of clinical studies, together with a discussion of specific clinical applications and a brief look to the future.     

Adrenal imaging agents: rationale, synthesis, formulation and, metabolism

In this introductory paper on radionuclide adrenal imaging, the rationale, synthesis, formulation, and metabolism of two clinically well-established and one promisinmg adrenocortical imaging agents are reviewed. Their present clinical utility is reviewed in a separate presentation in this issue. Progress to date in developing a positive imaging agent of the adrenal medulla and tumors of chromaffin tissue will be given brief consideration because there is, as yet, no clinically successful radiolabeled adrenal medulla imaging agent.     

Temporary Health Impact of Prostate MRI and Transrectal Prostate Biopsy in Active Surveillance Prostate Cancer Patients

PurposeTo assess the temporary health impact of prostate multiparametric MRI (mpMRI) and transrectal prostate biopsy in an active surveillance prostate cancer population.MethodsA two-arm institutional review board–approved HIPAA-compliant prospective observational patient-reported outcomes study was performed from November 2017 to July 2018. Inclusion criteria were men with Gleason 6 prostate cancer in active surveillance undergoing either prostate mpMRI or transrectal prostate biopsy. A survey instrument was constructed using validated metrics in consultation with the local patient- and family-centered care organization. Study subjects were recruited at the time of diagnostic testing and completed the instrument by phone 24 to 72 hours after testing. The primary outcome measure was summary testing-related quality of life (summary utility score), derived from the testing morbidities index (TMI) (scale: 0 = death and 1 = perfect health). TMI is stratified into seven domains, with each domain scored from 1 (no health impact) to 5 (extreme health impact). Testing-related quality-of-life measures in the two cohorts were compared with Mann-Whitney U test.ResultsIn all, 122 subjects were recruited, and 90% (110 of 122 [MRI 55 of 60, biopsy 55 of 62]) successfully completed the survey instrument. The temporary quality-of-life impact of transrectal biopsy was significantly greater than that of prostate mpMRI (0.82, 95% confidence interval [CI] 0.79-0.85, versus 0.95, 95% CI 0.94-0.97; P < .001). The largest mean domain-level difference was for intraprocedural pain (transrectal biopsy 2.6, 95% CI 2.4-2.8, versus mpMRI 1.3, 95% CI 1.1-1.5; P < .001).ConclusionTransrectal prostate biopsy has greater temporary health impact (lower testing-related quality-of-life measure) than prostate mpMRI.     

Modifiers of Cancer Screening Prevention Among Sexual and Gender Minorities in the Behavioral Risk Factor Surveillance System

PurposeIncreasing social acceptance of sexual and gender minorities may not translate to parity in health care access and health outcomes. Sexual orientation and gender identity (SOGI) may continue to contribute to differences in preventive health behavior including cancer screening. Our purpose was to estimate the independent effect of SOGI on breast, cervical, and colorectal cancer screening adherence.MethodsWe used sampling weighted data from 2016 Behavioral Risk Factor Surveillance System. We defined breast, cervical, and colorectal cancer screening using the US Preventive Services Task Force guidelines. All survey data were self-reported including demographic and medical information. We calculated the prevalence of screening by sexual orientation (straight, lesbian or gay, bisexual) and gender identity (cisgender, transgender). The term “sexual and gender minorities” in our study refers to lesbian or gay, bisexual, and transgender individuals. Logistic regression models assessed independent effect of SOGI on screening adherence.ResultsPrevalence of breast, cervical, and colorectal cancer screening varied significantly by SOGI. After adjusting for other variables, bisexual persons had significantly lower odds (odds ratio [OR] = 0.60, 95% confidence interval [CI] = 0.38-0.93) of breast cancer screening adherence. Lesbian or gay persons had significantly decreased likelihood (OR = 0.53, 95% CI = 0.29-0.95) of cervical cancer screening adherence. Although rate of colorectal cancer screening adherence varied significantly by SOGI, we did not find an independent effect of SOGI and colorectal cancer screening adherence after adjusting for other variables. No independent effect of gender identity categories on breast, cervical, and colorectal cancer screening adherence was detected. Social determinants of health, such as health care access and insurance, that disproportionately disadvantaged bisexual individuals independently influenced screening adherence.ConclusionsSOGI can affect cancer screening adherence. Bisexual individuals had worse health care access and socioeconomic hardships among sexual and gender minorities. Given the independent effects of social determinants of health on cancer screening adherence, more attention needs to be paid to sexual and gender minorities, especially bisexual population.